21221525

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{167}}^1$

素因数の和:230

約数の個数: 48

約数和(自身を含む): 31497984

約数和(自身を除く): 10276459

約数列:

[1, 5, 13, 17, 23, 25, 65, 85, 115, 167, 221, 299, 325, 391, 425, 575, 835, 1105, 1495, 1955, 2171, 2839, 3841, 4175, 5083, 5525, 7475, 9775, 10855, 14195, 19205, 25415, 36907, 49933, 54275, 65297, 70975, 96025, 127075, 184535, 249665, 326485, 848861, 922675, 1248325, 1632425, 4244305, 21221525]

約数ペア:

[(1, 21221525), (5, 4244305), (13, 1632425), (17, 1248325), (23, 922675), (25, 848861), (65, 326485), (85, 249665), (115, 184535), (167, 127075), (221, 96025), (299, 70975), (325, 65297), (391, 54275), (425, 49933), (575, 36907), (835, 25415), (1105, 19205), (1495, 14195), (1955, 10855), (2171, 9775), (2839, 7475), (3841, 5525), (4175, 5083)]